In a rare signal of disagreement with close ally Saudi Arabia, President Donald Trump urged the kingdom Wednesday to immediately lift its embargo of Yemen, citing the impoverished nation's humanitarian crisis.

The ICRC also recorded more than 400 injuries during the clashes, which first erupted in Sanaa over the weekend between the Houthis and pro-Saleh forces, Adnan Hazam, the ICRC’s spokesman in Yemen, said.

Yemen President Abed Rabbo Mansour Hadi on Monday rallied his countrymen in areas controlled by Houthis to rise up against the Iran-backed militia, who had just murdered their erstwhile ally former president Ali Abdullah Saleh.

At least 15 died when clashes broke out in Sanaa between Houthi rebels and forces loyal to former President Ali Abdullah Saleh, two groups allied in their fight against the internationally recognized Yemeni government.

The International Committee of the Red Cross said Wednesday it is buying 750,000 liters of diesel fuel to provide clean water to cities in Yemen affected by a blockade enforced by a Saudi-led coalition.

Millions of children are in desperate need of humanitarian assistance in Yemen, UNICEF’s Regional Director for the Middle East and North Africa said in a press conference Sunday in Jordan’s capital Amman.